Fuel pump issues
 

I have a 79 rx7 with the old 12a rotary in it. It has been having issues pumping fuel lately and when I go to start it if I have my foot on the brake the pump stops working. However if I let my foot off of the brake the fuel pump starts pumping. I recently put in a new fuel pump, ignition switch and cleaned out the gas tank of all the gunk in there. Anyone have any thoughts on it?